Here’s a concept layout. I think this is the photo you liked, and the font for Faith is Harrington. The rest of the quote would be in plain block letters.
In 20 point, this would be 9″x6″, and is just at the limit of what I think will provide good detail on her face.
If you were willing to go finer, it could get smaller or more detailed. Going to a larger size would also allow more detail. Maybe standard letter size, in landscape? Or would you want to keep the book smaller?